Sheet-metal casing for culverts, conduits, &amp;c.



A. SMITH. SHEET METAL CASING FOR GULVERTS, CONDUITS, 6w. APPLICATION FILED JULY 24, 1912.

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n A. SMITH. SHEET METAL CASING FOR. GULVBRTS, CONDUITS, &o. APPLICATION FILED JULY 24, 1912.

lmm fisa Patented Am. 1,1913.

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ANDREW SMITH,

OF SAN MATEO, CALIFGRNIA, ASSIGNGFR, 1P0 SMITH METAL EEHFD- RATING COMPANY, OF SAN MATEQ, CALIFORNIA.

SHEET-METAL CASING EUR CULVEETS, GUNDUETS, (ice.

Specification of Letters Patent.

Paton ted T Application filed Euly at, 1912. Serial No. 11,271.

To all whom it may concern:

Be it known that 1, ANDREW SMITH, a citizen of the United States, residing at San Mateo, in the county of San Mateo and State of California, have invented certain new and useful Improvements in Sheet-- Metal Casings for Culverts, Conduits, &c., of which the following is a specification.

My invention relates to sheet metal casings for culverts, irrigation tiling, drainage and other conduits, tunnels and the linings of oil and water wells, and the especial object of my present invention is to provide metal casing sections oi units which shall possess the advantages of strength and rigidity of the corrugated form and that may be readily assembled into a continuous ca ing or conduit without the necessity for auxiliary union or connecting members, While possessing the same strength at the joints as at the intermediate portions.

My present invention provides a casing which is adapted to resist the enormous pressures and lateral thrust-s induced by the load supported by a conduit, especially Where they underlie road crossingspnd railway embankments and also the longitudinal and torsional stresses and strains to which the casing may be subjected when used as a lining or strainer for yvells, which are frequently required to be bored to a depth of several thousand feet.

One of the chief difficulties heretoforeencountered in the use of metal casings and linings has been caused by the joints between the several units or sections. It is desirable that auxiliary connecting-members should be eliminated because they offer obstructions to the passage of the casing through a tunnel or the bore of a well, and itll'llllel'lllOlO, they necessitate the use of rivets or other fastening devices, which require additional labor and also become a source of weakness in the finished structurn. When the casing sections are joined by telescoping their meeting ends, or when a duplex casing is formed by telescoping the sections for one half their length, the joint between the sections becomes the weakest part of the casin This invention enables a continuous casing or conduit to be formed having joints which are of triple thickness, these multiplex joints being as rigid as the intermediate portions.

Another object of my invention is to pro tcrmi iting the smaller ends within vide a casing which shall pres t. substam tially smooth and unobstructed interior or exterior Walls.

In the accompanying"drawings Figures 1, 2 and 8 are longitudinal sections oi corru gated casings embodying my iuvcrtion; Fig. t is a longitudinal section of a cc having a smooth inner wall; 7 similar yicv of a casing having a outer wall; and Fig. 6 is a longitudi tion of a casing having smooth outer Walls. All of the figures three-ply or multiple:

In Fig. 1, l have structcd of similar s tions which taper w 1''. end and wnich arc telescopically to form a duplex with threely joints. It will be obs rved that each unit or section, as section 2, forms the inside Wall between the points 0;, i), becomes the intermediate member at the joint which cut ads from 7) to c and then terms the out wall from c to d. The metai the se is, therefore, three fold and the metal may extend 'tvvo or gations. The sections may be the larger end witl'i lu tween adjacent corru serve as abut-nients' to be tongs or machines which. are used c the pipe and thread the sections into telescopic union:

In Fig. 2, the casing is single-walled cept at the joints which are three-ply. have illustrated a different form or corruerr- For the nilrposc of securing a i thickness or" metal at t" e f sts. i i metal upon itself, pi for of two or more cormigations end of each section, shown at t. apparent that this rein'iorceiueut tions. The reinforced bands oi metal re- 1% sist lateral strains, while the reinforced corrugationsforin an exceedingly rigid anchor against longitudinal strains to t" g pull the sections apart or to crush the joint. By a smooth interior rugation as shown at 10, the ends present no obstructions Within the conduit. I

In Fig. 3, I have shown. a casing of the same type as Fig. 2, applied to the duplex form. This construction provides a casing having duplex walls at intermediate points and partly triple and partly quadruplex Walls at the joints. The metal at the larger end of each section is returned or folded back upon itself preferably for a distance of two or more corrugations. Each section forms the outer wall for a portion of its len h and then the inner wall for the re- Inamder of its length and terminates atan intermediate point of the joint, as shown at 12. The joints jare therefore, four-folded other section with which it interlocks, and

the smaller uncorrugated end of a third section.

Fig. 5-, illustrates a construction which is the reverse of Fig. 4-, in that the plain uncorrugated part of each section is the larger end and consequently forms 'the outer wall portion. This form of casing is frequently desirable because it. otters the minimum externa resistance when driven through a tunnel or well bore.

Fig. 6, illustrates a casing combining the features of Figs. 4 and 5, and is useful when smooth walls are.dcsired upon both the exterior and the interior of the casing. In this form the casing is four-fold at the joints i and threefold throughout the intermediate portions, thus constituting an exceedingly rigid casing. i

In the forms shown in Figs. 4, 5-and 6, the smooth walls present. no obstruction in the direction of the arrows. As illustrated, there is a slight oti'set at the end of each section equal to the thickness of the metal but it is evident that by graduating the height of the corrugations the ends could be made flush with the interior wall of the adjacent corrugation. For all practical purposes, however, the constructirm:-: as illustrated present smooth Walls.

The importance of this invention in'proriding a corrugated casing which can be interlocked Without auxiliary connectingmembers and which is stronger at the joints than throughout the intermediate portions will be appreciated by engineers. It is evident that the casing may be perforated in the manner disclosed in my application Serial No. 684177 filed March 16, 1912, if desired to adapt it for drainage or filtering purposes. 4

I have described in detail the constructions illustrated in the accompanying drawings for the purpose of disclosing embodi- .ments of my invention but I am aware that changes'may be made therein withontdeparting from my invention.

I claim: 1. A sheet metal casing for culverts, conduits, drainage tiling, etc, comprising interlocking spirally corrugated sections hav-ing' multiplex reinforced joints formed of integral portions thereof said reinforced joints extending around the entire periphery oi the casing.

2. A sheet metal casing for culverts, conduits, drainage tiling, etc., comprising interlocking spirally corrugated sections having three-fold walls throughout the joints formed of integral portions thereof.

3. A sheet metal casing for culverts, conduits, drainage tiling, etc., comprising interlocking corrugated sections having their meeting ends overlap to form reinforced joints of three or more thicknesses extending over a plurality of corrugations.

4. A sheet metal casing for culverts, conduits, drainage tiling, etc., comprising interlocking corrugated sections having three- .fold walls throughout the joints, the assembled casing having smooth interior walls.

. 5. A sheet metal "casing for culverts, conduits, drainage tiling, etc., comprising interlocking corrugated sections having threefold Walls throughout the joints, the assembled casinghaving smooth unobstructed exterior and interior walls.

6. A. sheet metal casing for culverts, conduits, drainage tiling, wells, etc, compris ing interlocking corrugated sections having three-fold walls throughout the joints, the assembled casing having smooth exterior walls.

7. Asheet metal casing for culverts, conduits, drainage tiling, wells, etc, comprising tapering interlocking corrugated sec time; having reinforced joints.-

In testimony whereof I afiix my signature in presence of two witnesses.

ANDREW SMITH.

- Witnesses:

EUGENE C. Brown, l JAMES M. SPEAK. 

